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Editing: wp-includes/php-ai-client/src/Results/DTO/TokenUsage.php

<?php

declare (strict_types=1);
namespace WordPress\AiClient\Results\DTO;

use WordPress\AiClient\Common\AbstractDataTransferObject;
/**
 * Represents token usage statistics for an AI operation.
 *
 * This DTO tracks the number of tokens used in prompts and completions,
 * which is important for monitoring usage and costs.
 *
 * Note that thought tokens are a subset of completion tokens, not additive.
 * In other words: completionTokens - thoughtTokens = tokens of actual output content.
 *
 * @since 0.1.0
 *
 * @phpstan-type TokenUsageArrayShape array{
 *     promptTokens: int,
 *     completionTokens: int,
 *     totalTokens: int,
 *     thoughtTokens?: int
 * }
 *
 * @extends AbstractDataTransferObject<TokenUsageArrayShape>
 */
class TokenUsage extends AbstractDataTransferObject
{
    public const KEY_PROMPT_TOKENS = 'promptTokens';
    public const KEY_COMPLETION_TOKENS = 'completionTokens';
    public const KEY_TOTAL_TOKENS = 'totalTokens';
    public const KEY_THOUGHT_TOKENS = 'thoughtTokens';
    /**
     * @var int Number of tokens in the prompt.
     */
    private int $promptTokens;
    /**
     * @var int Number of tokens in the completion, including any thought tokens.
     */
    private int $completionTokens;
    /**
     * @var int Total number of tokens used.
     */
    private int $totalTokens;
    /**
     * @var int|null Number of tokens used for thinking, as a subset of completion tokens.
     */
    private ?int $thoughtTokens;
    /**
     * Constructor.
     *
     * @since 0.1.0
     *
     * @param int $promptTokens Number of tokens in the prompt.
     * @param int $completionTokens Number of tokens in the completion, including any thought tokens.
     * @param int $totalTokens Total number of tokens used.
     * @param int|null $thoughtTokens Number of tokens used for thinking, as a subset of completion tokens.
     */
    public function __construct(int $promptTokens, int $completionTokens, int $totalTokens, ?int $thoughtTokens = null)
    {
        $this->promptTokens = $promptTokens;
        $this->completionTokens = $completionTokens;
        $this->totalTokens = $totalTokens;
        $this->thoughtTokens = $thoughtTokens;
    }
    /**
     * Gets the number of prompt tokens.
     *
     * @since 0.1.0
     *
     * @return int The prompt token count.
     */
    public function getPromptTokens(): int
    {
        return $this->promptTokens;
    }
    /**
     * Gets the number of completion tokens, including any thought tokens.
     *
     * @since 0.1.0
     *
     * @return int The completion token count.
     */
    public function getCompletionTokens(): int
    {
        return $this->completionTokens;
    }
    /**
     * Gets the total number of tokens.
     *
     * @since 0.1.0
     *
     * @return int The total token count.
     */
    public function getTotalTokens(): int
    {
        return $this->totalTokens;
    }
    /**
     * Gets the number of thought tokens, which is a subset of the completion token count.
     *
     * @since 1.3.0
     *
     * @return int|null The thought token count or null if not available.
     */
    public function getThoughtTokens(): ?int
    {
        return $this->thoughtTokens;
    }
    /**
     * {@inheritDoc}
     *
     * @since 0.1.0
     */
    public static function getJsonSchema(): array
    {
        return ['type' => 'object', 'properties' => [self::KEY_PROMPT_TOKENS => ['type' => 'integer', 'description' => 'Number of tokens in the prompt.'], self::KEY_COMPLETION_TOKENS => ['type' => 'integer', 'description' => 'Number of tokens in the completion, including any thought tokens.'], self::KEY_TOTAL_TOKENS => ['type' => 'integer', 'description' => 'Total number of tokens used.'], self::KEY_THOUGHT_TOKENS => ['type' => 'integer', 'description' => 'Number of tokens used for thinking, as a subset of completion tokens.']], 'required' => [self::KEY_PROMPT_TOKENS, self::KEY_COMPLETION_TOKENS, self::KEY_TOTAL_TOKENS]];
    }
    /**
     * {@inheritDoc}
     *
     * @since 0.1.0
     *
     * @return TokenUsageArrayShape
     */
    public function toArray(): array
    {
        $data = [self::KEY_PROMPT_TOKENS => $this->promptTokens, self::KEY_COMPLETION_TOKENS => $this->completionTokens, self::KEY_TOTAL_TOKENS => $this->totalTokens];
        if ($this->thoughtTokens !== null) {
            $data[self::KEY_THOUGHT_TOKENS] = $this->thoughtTokens;
        }
        return $data;
    }
    /**
     * {@inheritDoc}
     *
     * @since 0.1.0
     */
    public static function fromArray(array $array): self
    {
        static::validateFromArrayData($array, [self::KEY_PROMPT_TOKENS, self::KEY_COMPLETION_TOKENS, self::KEY_TOTAL_TOKENS]);
        return new self($array[self::KEY_PROMPT_TOKENS], $array[self::KEY_COMPLETION_TOKENS], $array[self::KEY_TOTAL_TOKENS], $array[self::KEY_THOUGHT_TOKENS] ?? null);
    }
}